Tool holder and tool



G. W. BUFFORD TOOL HOLDER AND TOOL June 19, 1923 1,458,973

Filed. Aug. 2 1919 Eg- I" INVENTOR By ftd/716315,

Patented .lune i9, i923.

u vnarra GEORGE W. nurronn, `or BUFFALO, NEW YORK, assreuor. 'ro J. H. WILLIAMS a oo oFBnooKLYN, NEW Yonah oonronn'rroiv or NEWYORK..

ivoor.I notnun'nun Toor..l

ApplicationI led Aug-ust 2, 1919; Serial No.' 314,982,

To all whom t may concern# Be itknoivn that l, GEORGE W. BUFroRD, a

citizen of the United States of America,ire

siding in Buffalo, Erie County, State of New `York, have inventedlcertain, new ,and useful Improvements in Toolv Holders; and Tools, of which the following is a specification. I

This invention relatesl to a tool and holder therefor and aims to provide certain improveniente therein. l

The invention is particularly directed to that type of tool which is cut from a bar of ferent tools are hence required for different machine operations. A very serious drawback to this construction is that different metals operated upon require different clearance in the tool, so that for the same operation there are required many different tools, dependent upon the precise character of the metal of which the part is to be constructed. Because of the expense of obtaining a large stock of tools, the common practice is to regrind the tool for every different operation.

This, of course, involves a great deal of ivaste in the tool steel, and very considerable time in grinding.

According to the present invention, I provide a tool of circular,cross-section, and a tool holder capable of clamping it in any angular position. This not only fits a tool with a given cutting face vfor a number of dierent operations, but enables the same tool to be used on a Wide diversity of metals, due to the fact that the clearance may be instantly adjusted to suit the metal upon which the operation is to be performed. The invention also includes other features of construction vvhich will be hereinafter more 'fully described.

Referring to the drawings, kWhich illustrate one form of the invention- Figure 1 is a side elevation of thepreferred form of tool and holder provided by my invention.,

F ig. 2 is a longitudinal section partly in` elevation.

Fig; 3 is -a cross-section on the line 3 3, Fig-lu l Figs. 4 to ll are views more or less diagrammatic showing the. application of the tool to dierent forms of Work. f

Referring to the drawings, let A indicate I the tool holder and B the tool. The shank of the tool holder may be of conventional form; the head of the holder is provided with a. cylindrical vsocket C Which adapted to receive the tool B. This socket eX- tends .longitudinally of the holder, or substantially so. Clamping means are provided for holding'the tool B inrfiXed relation With the tool holder, such clamping means `being shown as a'cam'l). lt Will be noted that the cam D has a groove E adapted to directly engage the body of the tool. The cam has an operating portion located at the top of the holder fory convenient access, this being isv shown in the form of a polygonal headv A* which may belengaged by a Wrench to turn the cam. i

The precise cutting face'on the tool may be variously shaped. In the tool shown in Fig. 2 both ends of the bar are provided with cutting faces. By reason of the circular contour of the tool stock, and the similarly formed socket in the tool holder With clamping means adapted to engage the tool in any angular position, it is possible to bring successive faces of the tool into operative position. Thus, in Figs. 5 and 6 there is illustrated the same tool usedasa right and left hand side tool. Fig. 4 illustrates a diamond point tool used as a left hand side tool, with the tool holder in an angular position. Figs. 7 and 8 illustrate thel diamond point tool used as a thread cutting tool in tivo different positions. Figs. 9, 10 and 11 illustrate the use ofanother .form of diamond point tool used as a thread cutting tool, a right hand facing tool, and an inside facing tool, respectively. l

A n important fea-ture of theinvention is that in many of the operations Whichthe same tool is called upon to perform, the different degrees of clearance required' may be By this ineans a Single tool will sutlice for a large nuinber of operations, and a single grinding will 1Keep the tool in condition. As before stated, this obviates to a large extent the many grinding` operations now performed and avoids considerable Wastage in the tool steel.

I have 'found in practice that the best results are obtained by mounting the tool in the holder in a, substantially horizontal positiont or one which does not tilt materially upward. Preferably the tool extends` in suhstantially axial alineinent `with the tool holder.

lVhile l have Shown and described several forms of the invention, it will be understood that do not Wish to be limited thereto as various changes may be made therein Without departing from the invention.

That I claim is l. The combination of a tool holder and a tool, the tool being circular in cross-section and the tool holder having a` Socket approximately conforming thereto, and a cani adapted to engage the tool at any point in its circumference, the cam having a curved face Which is eoncaved to lit the side of the tool.

2. The combination With a tool holder of a bar tool of circular cross-section throughout and a vertically arranged carn for hold ing theJ tool at any point on its circumference, the cam having` a face which is curved to t the circular side of the tool.

In Witness whereof, I have hereunto signed my name.

GEORGE W. BUFFoRD. 

